I haven't studied Biology since secondary school but I am thinking of getting into it again. Hereditary diseases and genetic disorders which can be passed down by parents is something I am very interested in.

Parents who suffer/ have suffered from things like Breast Cancer, Psoriasis, Balding & Heart Disease have a high chance of passing this down to their offspring. I don't know much about Biology but I believe it is unlikely anything can be done once the foetus is in the womb - the only thing being possible being detection, making things like IVF the way to have contact with the Sperm & Egg before the foetus develops.

Is it possible to detect these illnesses/ chance of it happening using this way and then remove them?

if you know the gene responsible, then you can test for them. And it's done. But you cannot repair whole bunch of cells. Since ever you have two and more cells you face the same problem as when trying to repair cells in grown man. Of course with the fetus it would be sort of easier (let's say the spread during growth would be bigger), but on the other hand you'd had problem with the mother.